Drepanomonas revoluta Penard, 1922

Kim, Ji Hye & Jung, Atef Omar and Jae-Ho, 2020, Brief description of 18 newly recorded ciliate species from soil and inland waters (Protozoa, Ciliophora) in South Korea, Journal of Species Research 9 (3), pp. 251-268 : 262-263

14. Drepanomonas revoluta Penard, 1922 ( Fig. 14 )

Material examined. Terrestrial soil collected from Mt. Hambaeksan , Hyeol-dong , Taebaek-si, Gangwon-do, Korea (N 37°9 ʹ 23.8 ʺ, E 128°54 ʹ 59.3 ʺ) on 17 May 2018 .

Diagnosis. Size in vivo 25 - 30 × 10 - 15 μm (n = 5). Body semi ellipsoidal. One macronucleus and one micronucleus. Cortex rigid, right side smooth except of minute crenellation along ciliary rows. Left side with longitudinal, deep, and wide furrow. Contractile vacuole slightly posterior and dorsal to oral structures. Cytopyge posteri- or and left to contractile vacuole. Extrusomes lenticular and left of somatic kineties. Cytoplasm colorless with minute lipid droplets and food vacuoles containing bacteria. Nine somatic and three preoral kineties, each somatic kinety consists of few dikinetids and few monokinetids with large gaps in the middle; preoral kineties consist of two or three dikinetids and each with a single monokinetid posteriorly. Oral apparatus in mid-body containing oral membranelles and oral primordium.

Distribution. Cosmopolitan.

Remarks. The Korean population of D. revoluta resembles the type population ( Penard, 1922) and the Austri- an population described by Foissner (1987) in the size (25 - 30 × 10 - 15 μm vs. 20 - 30 × 10 - 15 μm), shape, the ciliary pattern, and the deep, wide furrow on the left side. It is also very similar to D. vasta Foissner & Omar 2013 ( Omar and Foissner, 2013) differing mainly in the structure of somatic kinety 4 (3 or 4 vs. only one ciliated dikinetid anteriorly), the total number of basal bodies (80 vs. 90 on average), and the body shape (distinctly flattened vs. thick) ( Omar and Foissner, 2013).

Voucher slides. Two slides with protargol-impregnated specimens were deposited at the Nakdonggang National Institute of Biological Resources (NNIBRPR11668, NNIBRPR11669).

Figures

Fig. 14. Drepanomonas revoluta from life (A-C) and after protargol impregnation (D). A. Body outline in vivo. B. Note the deep wide furrow on the left side. C. Left side in vivo. D. Somatic and oral ciliature on right side. CV, contractile vacuole; CY, cytopyge; F, furrow; K1- 9, somatic kineties; MA, macronucleus; MI, micronucleus; PC, postoral complex; PO, preoral kineties. Scale bars=10μm.